Perfect hash join panics with overflow on full-range signed integer keys #20995

#[tokio::test]
async fn test_perfect_hash_join_overflow_full_int64_range() -> Result<()> {
    let task_ctx = prepare_task_ctx(8192, true);
    let schema = Arc::new(Schema::new(vec![Field::new("a", DataType::Int64, true)]));
    let batch = RecordBatch::try_new(
        Arc::clone(&schema),
        vec![Arc::new(Int64Array::from(vec![i64::MIN, i64::MAX]))],
    )?;
    let left = TestMemoryExec::try_new_exec(&[vec![batch.clone()]], Arc::clone(&schema), None)?;
    let right = TestMemoryExec::try_new_exec(&[vec![batch]], schema, None)?;
    let on: JoinOn = vec![(
        Arc::new(Column::new_with_schema("a", &left.schema())?) as _,
        Arc::new(Column::new_with_schema("a", &right.schema())?) as _,
    )];
    let (_columns, _batches, _metrics) = join_collect(
        left, right, on, &JoinType::Inner,
        NullEquality::NullEqualsNothing, task_ctx,
    ).await?;
    Ok(())
}

let range = ArrayMap::calculate_range(min_val, max_val);  // line 156
let num_row: usize = batches.iter().map(|x| x.num_rows()).sum();
let dense_ratio = (num_row as f64) / ((range + 1) as f64);  // line 158 — OVERFLOW
// ...
if range == usize::MAX as u64 {  // line 174 — guard is too late
    return Ok(None);
}

let Some(range_plus_one) = range.checked_add(1) else {
    return Ok(None);
};
let dense_ratio = (num_row as f64) / (range_plus_one as f64);